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R1290 Series
Triple Output DCDC Converter for LCD/CCD

Product Specifications

The R1290 Series are triple output CMOS-based step-up/inverting DC/DC converters. R1290 consists of the inductor type PWM step-up DC/DC converter (DC/DC1) with an internal 2A Nch. driver and charge pump type positive/negative DC/DC converters (DC/DC2, DC/DC3). Triple output start-up sequence can be set by external capacitors. R1290 is ideally suitable for use in power source for equipment that requires sequence control such as LCD and CCD.

FEATURES

  Consumer Automotive
Input Voltage Range (Maximum Rating) 2.0 V to 5.5 V (6.5 V)
Operating Temperature Range −40°C to 95°C −40°C to 105°C
Step-up DCDC Controller Built-in 2 A Nch-switch (RON = 150 mΩ Typ.)
Overcurrent Protection
Adjustable VOUT up to 20 V with external resistors
Temperature Coefficient of VFB: Typ. ±150 ppm/°C
Adjustable Phase compensation with external components
Maxduty adjustable with external resistors for DTC pin
Soft-start time adjustable with external capacitor for SS pin
Oscillator Frequency: Adjustable frequency with resistors (180 kHz to 1400 kHz)
Charge-pump Adjustable output voltage with external resistors
Temperature Coefficient of VREF: Typ. 150 ppm/°C
Temperature Coefficient of CPPFB: Typ. 150 ppm/°C
Sequence function: Charge-pump turns on after the main step-up converter voltage outputs. The positive charge-pump and the negative charge-pump turn-on sequence control is adjustable by setting delay time for each channel
Oscillator Frequency: 1/4 of the main step-up DC/DC converter oscillator frequency
Controller Under Voltage Lock-Out (UVLO: selectable detector threshold from 1.8 V/ 2.2 V/ 2.8 V)
Short Protection with timer latch function (adjustable delay time with external capacitor)
Shutdown all the outputs if at least one of three outputs is shorted to the GND.
Stand-by function by CE pin
Package QFN0404-24

APPLICATION INFORMATION

For external parts, please refer to the datasheet.

PIN DESCRIPTION

QFN0404-24

QFN0404-244.0 mm × 4.0 mm
1 PGND
2 PGND
3 AGND
4 VIN
5 VREF
6 CE
7 VFB
8 SS
9 TST
10 DTC
11 DELAY
12 AMPOUT
13 RT
14 CPNDLY
15 CPNFB
16 CPPDLY
17 CPPFB
18 CPGND
19 CPN
20 CPVCC
21 CPP
22 CPPSW
23 Lx
24 Lx

*) The tab is substrate level (GND).


R1290 Series for Consumer

APPLICATIONS

  • Power source for hand-held equipment
  • Power source for LCD and CCD

PRODUCT LONGEVITY PROGRAM

R1290 series for consumer applications operate PRODUCT LONGEVITY PROGRAM.
This program has been introduced to help customers select the most appropriate part for applications that require long life cycles.


SELECTION GUIDE

The UVLO threshold voltage can be selected at the user’s request.

Product Name   Package Quantity per Reel
R1290K10xA−E2 ConsumterPLP QFN0404-24 1,000
  • x … Designation of UVLO threshold
    1: 1.8V
    2: 2.2V
    3: 2.8V

DOCUMENT/CONTACT

Purchase

Technical Support

Package *1 Marking Reliability *2
QFN0404-24 R1290K R1290K

*1: The package file includes package dimensions, taping specifications, taping reels dimensions, power dissipations, and land pattern (foot pattern).
*2: Reliability file includes a reliability test report and a reflow profile.


R1290 Series for Automotive

Ricoh is committed to providing a semiconductor device with the highest level of quality and reliability by restricting the device manufacturing only within Ricoh and the cooperative companies successfully passed our stringent inspections for automotive products. Ricoh established a traceability system and manages manufacturing information and logistics information from the warehouse.


Quality Ranks for Applications

Ricoh offers three different quality ranks for automotive products according to their application purposes.
R1290 Series offer products in Rank 3.

Rank 3: Automotive Accessories

  • Power source for car accessories such as car audio equipment, car navigation system, and ETC system

PRODUCT LONGEVITY PROGRAM

R1290 series for automotive applications operate PRODUCT LONGEVITY PROGRAM.
This program has been introduced to help customers select the most appropriate part for applications that require long life cycles.


Operating Temperature Range : -40°C to 105°C


SELECTION GUIDE

The UVLO threshold voltage is user-selectable.

Product Name   Package Quantity per Reel
R1290K10xA-E2-AE AutomotiveAutomotive AccessoriesPLP QFN0404-24 1,000
  • x … Designation of UVLO threshold
    1: 1.8V
    2: 2.2V
    3: 2.8V

DOCUMENT/CONTACT

Purchase

Technical Support

Package*1 Reliability*2
QFN0404-24 R1290K (-AE)

*1: The package file includes package dimensions, taping specifications, taping reels dimensions, power dissipations, and land pattern (foot pattern).
*2: Reliability file includes a reliability test report and a reflow profile.
*3: The reliability information is not listed for devices above rank2. Please contact Ricoh sales representatives for further informations.

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